Ostium

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

## Overview

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An ostium is a small opening or orifice, as in a body organ or passage.

## Anatomy

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* Ostium of Fallopian tube.
* Ostium primum or foramen ovale (ostium secundum) of the developing heart.
* Ostium maxillare of the Maxillary Sinus
* Ostium of uterus
* Ostium vaginae (vaginal orifice)
* Coronary ostium (Opening of coronary arteries at root of aorta, superior to aortic valve)

## Ostial Disease

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Ostial disease refer to diseases involving the ostium of a body organ, passage or vessel. In particular, ostial stenosis is a narrowing in a ostium. It can refer to:

* Coronary ostial stenosis
* Renal ostial stenosis

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